﻿using System;
using System.Collections.Generic;

public class EventCenter
{
    private static Dictionary<EventType, Delegate> m_EventTable = new Dictionary<EventType, Delegate>();

    private static void ListenerAdding(EventType eventType, Delegate callBack)
    {
        if (!m_EventTable.ContainsKey(eventType))
        {
            m_EventTable.Add(eventType, null);
        }
        Delegate d = m_EventTable[eventType];
        if (d != null && d.GetType() != callBack.GetType())
        {
            throw new Exception(string.Format("尝试为事件{0}添加不同类型的委托，当前事件" +
                "对应的委托是{1},要添加的委托类型为{2}", eventType, d.GetType(), callBack.GetType()));
        }
    }
    private static void ListenerRemoving(EventType eventType, Delegate callBack)
    {
        if (m_EventTable.ContainsKey(eventType))
        {
            Delegate d = m_EventTable[eventType];
            if (d == null)
            {
                throw new Exception(string.Format("移除监听错误：事件{0}没有对应的委托", eventType));
            }
            else if (d.GetType() != callBack.GetType())
            {
                throw new Exception(string.Format("移除监听错误：尝试为事件{0}移除不同类型的委托，" +
                    "当前委托类型为{1},要移除的委托类型为{2}", eventType, d.GetType(), callBack.GetType()));
            }
        }
        else
        {
            throw new Exception(string.Format("移除监听错误，没有事件{0}", eventType));
        }
    }
    private static void ListenerRemoved(EventType eventType)
    {
        if (m_EventTable[eventType] == null)
        {
            m_EventTable.Remove(eventType);
        }
    }
    /// no parameters
    public static void AddListener(EventType eventType, CallBack callBack)
    {
        ListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack)m_EventTable[eventType] + callBack;
    }

    /// single parameters
    public static void AddListener<T>(EventType eventType, CallBack<T> callBack)
    {
        ListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T>)m_EventTable[eventType] + callBack;
    }

    /// two parameters
    public static void AddListener<T, X>(EventType eventType, CallBack<T, X> callBack)
    {
        ListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X>)m_EventTable[eventType] + callBack;
    }

    /// three parameters
    public static void AddListener<T, X, Y>(EventType eventType, CallBack<T, X, Y> callBack)
    {
        ListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y>)m_EventTable[eventType] + callBack;
    }

    /// four parameters
    public static void AddListener<T, X, Y, Z>(EventType eventType, CallBack<T, X, Y, Z> callBack)
    {
        ListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y, Z>)m_EventTable[eventType] + callBack;
    }

    /// five parameters
    public static void AddListener<T, X, Y, Z, W>(EventType eventType, CallBack<T, X, Y, Z, W> callBack)
    {
        ListenerAdding(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y, Z, W>)m_EventTable[eventType] + callBack;
    }

    /// no parameters
    public static void RemoveListener(EventType eventType, CallBack callBack)
    {
        ListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack)m_EventTable[eventType] - callBack;
        ListenerRemoved(eventType);
    }

    /// single parameters
    public static void RemoveListener<T>(EventType eventType, CallBack<T> callBack)
    {
        ListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T>)m_EventTable[eventType] - callBack;
        ListenerRemoved(eventType);
    }

    /// two parameters
    public static void RemoveListener<T, X>(EventType eventType, CallBack<T, X> callBack)
    {
        ListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X>)m_EventTable[eventType] - callBack;
        ListenerRemoved(eventType);
    }

    /// three parameters
    public static void RemoveListener<T, X, Y>(EventType eventType, CallBack<T, X, Y> callBack)
    {
        ListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y>)m_EventTable[eventType] - callBack;
        ListenerRemoved(eventType);
    }

    /// four parameters
    public static void RemoveListener<T, X, Y, Z>(EventType eventType, CallBack<T, X, Y, Z> callBack)
    {
        ListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y, Z>)m_EventTable[eventType] - callBack;
        ListenerRemoved(eventType);
    }

    /// five parameters
    public static void RemoveListener<T, X, Y, Z, W>(EventType eventType, CallBack<T, X, Y, Z, W> callBack)
    {
        ListenerRemoving(eventType, callBack);
        m_EventTable[eventType] = (CallBack<T, X, Y, Z, W>)m_EventTable[eventType] - callBack;
        ListenerRemoved(eventType);
    }

    /// no parameters
    public static void Broadcast(EventType eventType)
    {
        Delegate d;
        if(m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack callBack = d as CallBack;
            if (callBack != null)
            {
                callBack();
            }
            else
            {
                // throw new Exception(string.Format("广播事件错误，事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }

    /// single parameters
    public static void Broadcast<T>(EventType eventType, T arg)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T> callBack = d as CallBack<T>;
            if (callBack != null)
            {
                callBack(arg);
            }
            else
            {
                // throw new Exception(string.Format("广播事件错误，事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }

    /// two parameters
    public static void Broadcast<T, X>(EventType eventType, T arg, X arg1)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T, X> callBack = d as CallBack<T, X>;
            if (callBack != null)
            {
                callBack(arg, arg1);
            }
            else
            {
                // throw new Exception(string.Format("广播事件错误，事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }

    /// three parameters
    public static void Broadcast<T, X, Y>(EventType eventType, T arg, X arg1, Y arg2)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T, X, Y> callBack = d as CallBack<T, X, Y>;
            if (callBack != null)
            {
                callBack(arg, arg1, arg2);
            }
            else
            {
                // throw new Exception(string.Format("广播事件错误，事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }

    /// four parameters
    public static void Broadcast<T, X, Y, Z>(EventType eventType, T arg, X arg1, Y arg2, Z arg3)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T, X, Y, Z> callBack = d as CallBack<T, X, Y, Z>;
            if (callBack != null)
            {
                callBack(arg, arg1, arg2, arg3);
            }
            else
            {
                // throw new Exception(string.Format("广播事件错误，事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }

    /// five parameters
    public static void Broadcast<T, X, Y, Z, W>(EventType eventType, T arg, X arg1, Y arg2, Z arg3, W arg4)
    {
        Delegate d;
        if (m_EventTable.TryGetValue(eventType, out d))
        {
            CallBack<T, X, Y, Z, W> callBack = d as CallBack<T, X, Y, Z, W>;
            if (callBack != null)
            {
                callBack(arg, arg1, arg2, arg3, arg4);
            }
            else
            {
                // throw new Exception(string.Format("广播事件错误，事件{0}对应委托具有不同的类型", eventType));
            }
        }
    }
}
